[BLDG-SIM] VAV fume hood exhaust

[Chris Jones]

You can model the exhaust fans as the Return fan.  Set the MIN-OUTSIDE-AIR 
to 1.  To model VAV you need to set a MIN-CFM-SCHEDULE to match the 
behaviour of the fume hoods opening and closing (it is tricky to determine 
exactly this behavior).  This way you can attempt to capture any heat 
recovery available.


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>Unless you can predict exactly how the fume cupbards will be utilised, is 
>there a need to model them as VAV?  I used DOE-2.2 a couple of years ago 
>to look at a similar arrangement and we diversified the fume cupboards so 
>that we effectively modelled a constant exhaust rate.  Set this up as a 
>parameter and then run for different values to see how sensitive 
>performane is to fume cupboard use / diversity ...
>Graham
>----- Original Message -----
>From: <mailto:razerbegi at rmhgroup.com>Azerbegi, Renee
>To: <mailto:BLDG-SIM at gard.com>BLDG-SIM at gard.com
>Sent: Saturday, March 20, 2004 3:13 AM
>Subject: [BLDG-SIM] VAV fume hood exhaust
>
>Has anyone modeled a VAV fume hood exhaust for a laboratory in eQuest? 
>Since the laboratory requires 100% outside air, a return fan is not 
>simulated obviously. The exhaust fan part on the air-handling unit fan 
>page of eQuest doesn't seem to be able to be modeled. If I put the exhaust 
>in each zone, then I can't specify that the fans are VAV. Please let me 
>know if you have had luck with modeling this type of system in eQuest.
>Thanks,
>Renee
>
>
>Renee Azerbegi
>RMH Group
>Lakewood, Colorado
>303-239-0909
>
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Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005 

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